Wrench



1933- D. F. MQTGHELL. 1,909,702

WRENCH Filed Aug, 25 1931 Patented May 16, 1933 STATS UNiTE DAVID F. MITCHELL, F STATEN ISLAND, NEW YORK WRENCH Application filed August 25, 1931. Serial No. 569,175.

My invention relates to improvements in wrenches and is particularly directed to a wrench of the internal or socket type.

My wrench is particularly adapted for use in connection with the securing in place and removal of ferrules in steam condensers and the like.

Heretofore it has been customary to provide ferrules with notches to receive a wrench. However, these notches have been objectionable because of the mutilation of the ferrule at the notches from the continuous use of the wrench. With my, improved wrench no notches are necessary in the ferrules-hence the life of the ferrules will be prolonged. Other wrenches have been made wherein expanding or adjustable jaws are provided but with such wrenches it is necessary to screw a wedge into the aws to adjust or expand the same into engagement with the ferrule.

One of the objects of my invention is the provision of a wrench of simple construction which can readily be inserted in a ferrule and the ferrule immediately rotated in either direction thereby without the necessity of adjusting any part of the wrench.

Another object of my invention is the provision of a wrench which will frictionally engage and securely grip the inner wall of the ferrule regardless of the direction the wrench is rotated, that is, clockwise, in screwing the ferrule into position or anticlockwise in removing the ferrule.

Other objects of my invention will be apparent from the following description and accompanying drawing, in which drawing Fig. 1 is an elevational view of my improved wrench together with a sectional view of a ferrule in a tube sheet of a condenser;

Fig. 2 is a sectional view on line 2-2 of Fig. 1 looking in the direction of the arrows; and

Fig. 3 is a sectional view on line 3-3 of Fig. 1 looking in the direction of the arrows.

Referring to the drawing in detail, 1 designates the handle or body portion of the wrench, this handle being provided with an opening 2 at its outer end for receiving 50 a bar 3 to facilitate the rotation of the wrench. The other end of the wrench is cut away to provide a cam surface 4 Onthis end is also formed an integral end plate 5 provided with aneccentric groove or guideway 6 to receive a hub 7 of a roller 8. The body portion 1 is provided with an enlarged head 9 having another groove or guideway 10 similar in shape to the groove or guideway 6, this latter groove receiving the other end of the roller 8. The head 9 is also provided with an annular fiange ll to prevent the displacement of the roller 8.

. lVhen using my improved wrench the forward end is inserted in a ferrule 12 with the roller 8 in the position shown in full lines in-Figs. 2 and 3, the diameter of the roller 8 and the contour of the cam 4 being such that when the roller is in this position the roller is within the periphery of the end plate 5, so as to permit of free insertion of the wrench in the ferrule.

Assuming now that it is desired to employ the wrench to remove the ferrule 12 from the tube sheet, the wrench will be rotated in anticlockwise direction, the slight frictional engagement of the roller with the inner wall of the i ferrule permitting the wrench to rotate relatively to the roller carrying the cam 4: and grooves 6 and 11 in anticlockwise direction while the roller 8 remains in contact with the inner wall of the ferrule. As the wrench is rotated in an anticlockwise direction, it will be obvious that the cam 4, will force the roller 8 beyond the periphery of the end plate 5 and into contact with the'inner wall of the ferrule, as shown in dotted lines in Fig. 3,, whereby the diagonally opposite wall of the forward end of the wrenchwill be forced against the inner wall of the ferrule as indicated at 13 in Fig. 3, thereby making a two-point contact with the inner wall of the ferrule. The wrench will be thereby locked in the ferrule and will remain in this 5 locked position upon further rotation of the wrench in the same direction and when thus locked it will be obvious that the'ferrule may readily be turned out of the tube sheet upon the continued rotation of the M0 wrench in the same direction. To release the wrench it is merely necessary to rotate the same in the opposite direction whereby the roller will disengage the inner wall of the ferrule and return to inoperative position within the periphery of the end plate 5.

It will be obvious that in securing a ferrule in a tube sheet the wrench would be rotated in the opposite or clockwise direc tion which would cause the cam to force the roller against the inner wall of the ferrule in the same manner as just described. If desired instead of a bar 3 the end of the wrench may be square or hexagon in cross-section whereby the same may be engaged by another wrenc It, is to be understood that while my wrench has particular application to ferrules in steam condensers I do not wish to be limited to such use as obviously my Wrench has manifold applications.

While I have illustrated and described one embodiment of my invention it is to be understood that various modifications may be made therein without departing from the spirit and scope ofmy invention.

What I claim is:

1. A ferrule wrench comprising in combination abody portion cut away to provide an integral cam portion and integral endrportions, a roller adapted to ride on said cam portion in parallel relation with respect to the axis of said body portion, guideways in said end portions for each 3 end of said roller, means carried by said body portion for rotating said wrench in a clockwise or an anticlockwise direction to cause said roller to move outward into engagement with the inner wall of the ferrule. 40 2. A wrench comprising a body portion, one end of which 1s cut away to provide an eccentric cam surface and an integral end plate. ,a roller adapted to ride on said surface, a guide for one end of said roller in said end plate and a guide for the other end of said roller in the body portion. .3. A ferrule wrench comprising in combination a body portion cut away at one end to provide a cam portion eccentric thereto and to provide a concentric integral end portion, a roller adapted to ride on said cam portion, a guideway formed in said end portion for guiding and retaining one end vof said roller in said body portion, a guideway formed in said body portion adjacent the other end. of said cam portion for the other end of said roller, and means carried by said body portion for rotating said wrench in a clockwise or anti-clockwise direction to cause said roller to move outward into engagement with the inner wall of the ferrule. V

This specification signed this 21st day of August, 1931;

DAVID .F. MITCHELL. 

